Evaporator with improved droplet separation

Abstract

An evaporator ( 1 ) for vaporizing a substance into its gaseous form, which comprises at least a plate pack ( 4 ) functioning as an evaporator and a droplet separator arranged inside the outer casing. An outlet connection ( 6 ) for leading the vaporised substance out from the outer casing is arranged to an end plate of outer casing, and said outlet connection ( 6 ) is connected to a suction duct ( 10 ) arranged inside the outer casing in a longitudinal direction of the shell, and said suction duct ( 10 ) comprises openings ( 12 ) at the upper surface of the suction duct, wherein the droplet separator is constructed at both sides of the suction duct ( 10 ).

The invention claimed is: 
     
       1. An evaporator for vaporizing a substance into a gaseous form thereof, wherein the evaporator comprises:
 an outer casing, which comprises a substantially horizontal shell, substantially vertical first and second end plates, 
 a suction duct arranged inside the outer casing in a longitudinal direction of the shell, the suction duct having an upper surface and openings formed in the upper surface, 
 an inlet connection for leading a substance to be vaporized into the outer casing, 
 an outlet connection for leading vaporized substance out from the outer casing, the outlet connection being arranged at one of the first and second end plates of the outer casing, 
 a plate pack functioning as an evaporator, which is arranged inside the outer casing, in its lower part, 
 an inlet connection and an outlet connection for a heating substance for leading a heating substance into the plate pack and out from it, 
 a droplet separator is arranged inside the outer casing above the plate pack, the droplet separator comprising first and second demister parts which are arranged at both sides of and are connected to the suction duct such that the upper surface of the suction duct is positioned above the first and second demister parts, and 
 a cover plate arranged above the first and second demister parts of the droplet separator and the suction duct, the cover plate having a length which corresponds with a length of the first and second demister parts and having an elongated cross-direction extending from a lower edge of the first demister part to a lower edge of the second demister part. 
 
     
     
       2. The evaporator according to  claim 1 , wherein the inlet connection is arranged at one of the first and second end plates of the outer casing. 
     
     
       3. The evaporator according to  claim 1 , wherein the suction duct extends in the longitudinal direction of the horizontal shell from the first end plate to the second end plate. 
     
     
       4. The evaporator according to  claim 1 , wherein the suction duct extends through at least one of the first and second end plates of the outer casing. 
     
     
       5. The evaporator according to  claim 4 , wherein the suction duct extends through both of the first and second end plates. 
     
     
       6. The evaporator according to  claim 1 , wherein the openings are formed in the upper surface of the suction duct substantially along an entire length of the suction duct. 
     
     
       7. The evaporator according to  claim 1 , wherein the first and second demister parts of the droplet separator comprise two superposed perforated plates defining a space therebetween which is filled with a gas-permeable material. 
     
     
       8. The evaporator according to  claim 1 , wherein the first and second demister parts have lengths substantially corresponding to a length of the plate pack, and wherein the first and second desmister parts installed diagonally downwardly from a midpoint line of the shell toward respective edges of the shell. 
     
     
       9. The evaporator according to  claim 1 , wherein the cover plate has a corresponding shape corresponding with an inner surface of the shell. 
     
     
       10. The evaporator according to  claim 1 , wherein each of the suction duct, the first and second demister parts arranged on both sides of the suction duct and the cover plate are formed as separate components arranged inside the outer casing. 
     
     
       11. The evaporator according to  claim 1 , wherein
 the first and second end plates are arranged at respective ends of the cover plate, and wherein 
 the first and second demister parts are respectively attached to the first and second end plates. 
 
     
     
       12. The evaporator according to  claim 1 , wherein the evaporator comprises two outlet connections arranged at both ends of the suction duct for leading the vaporized substance out from the outer casing.